diff --git a/School/Analyse/OSI Model.md b/School/Analyse/OSI Model.md
index 62e09d9..5011743 100644
--- a/School/Analyse/OSI Model.md	
+++ b/School/Analyse/OSI Model.md	
@@ -27,6 +27,18 @@ These services are usually protocols that interact with the data that the user u
 For example a web browser like Google Chrome uses the HTTP protocol to browse files on the internet. And the mail client Outlook uses the SMTP protocol to send mail via the internet.
 
 ## 6. Presentation Layer
+The presentation layer is responsible for preparing the data so that it can be used by the Application Layer. 
+
+**Presentation layer is responsible for:**
+- Translation of data
+- Encryption of data
+- Compression of data
+
+For example, two devices can use different types of encoding on their data, the presentation layer will translate the data in a way that the Application Layer can understand.
+
+When sending sensitive data, we would like to encrypt the data so that its secure. The Presentation layer is responsible for encrypting and decrypting ingoing or ou
+
+
 ## 5. Session Layer
 ## 4. Transport Layer
 ## 3. Network Layer